patch.diff

diff --git a/truffle/src/main/java/org/jruby/truffle/nodes/core/TrufflePrimitiveNodes.java b/truffle/src/main/java/org/jruby/truffle/nodes/core/TrufflePrimitiveNodes.java
index 356a478..b8ba1cd 100644
--- a/truffle/src/main/java/org/jruby/truffle/nodes/core/TrufflePrimitiveNodes.java
+++ b/truffle/src/main/java/org/jruby/truffle/nodes/core/TrufflePrimitiveNodes.java
@@ -539,4 +539,19 @@ public abstract class TrufflePrimitiveNodes {
         }
     }
 
+    @CoreMethod(names = "clock_gettime_monotonic", onSingleton = true)
+    public abstract static class ClockGetTimeMonotonicNode extends CoreMethodArrayArgumentsNode {
+
+        public ClockGetTimeMonotonicNode(RubyContext context, SourceSection sourceSection) {
+            super(context, sourceSection);
+        }
+
+        @TruffleBoundary
+        @Specialization
+        public double clockGetTimeMonotonic() {
+            return getContext().getMonotonicClock().clock_gettime_monotonic();
+        }
+
+    }
+
 }
diff --git a/truffle/src/main/java/org/jruby/truffle/runtime/ClockGetTimeMonotonic.java b/truffle/src/main/java/org/jruby/truffle/runtime/ClockGetTimeMonotonic.java
new file mode 100644
index 0000000..6472d63
--- /dev/null
+++ b/truffle/src/main/java/org/jruby/truffle/runtime/ClockGetTimeMonotonic.java
@@ -0,0 +1,16 @@
+/*
+ * Copyright (c) 2015 Oracle and/or its affiliates. All rights reserved. This
+ * code is released under a tri EPL/GPL/LGPL license. You can use it,
+ * redistribute it and/or modify it under the terms of the:
+ *
+ * Eclipse Public License version 1.0
+ * GNU General Public License version 2
+ * GNU Lesser General Public License version 2.1
+ */
+package org.jruby.truffle.runtime;
+
+public interface ClockGetTimeMonotonic {
+
+    double clock_gettime_monotonic();
+
+}
diff --git a/truffle/src/main/java/org/jruby/truffle/runtime/RubyContext.java b/truffle/src/main/java/org/jruby/truffle/runtime/RubyContext.java
index a0b7082..06941f4 100644
--- a/truffle/src/main/java/org/jruby/truffle/runtime/RubyContext.java
+++ b/truffle/src/main/java/org/jruby/truffle/runtime/RubyContext.java
@@ -87,6 +87,7 @@ public class RubyContext extends ExecutionContext implements TruffleContextInter
 
     private final POSIX posix;
     private final NativeSockets nativeSockets;
+    private final ClockGetTimeMonotonic monotonicClock;
 
     private final CoreLibrary coreLibrary;
     private final FeatureManager featureManager;
@@ -156,6 +157,10 @@ public class RubyContext extends ExecutionContext implements TruffleContextInter
         loader.library("c");
         nativeSockets = loader.load();
 
+        final LibraryLoader<ClockGetTimeMonotonic> clockLoader = LibraryLoader.create(ClockGetTimeMonotonic.class);
+        clockLoader.library("kruntime");
+        monotonicClock = clockLoader.load();
+
         warnings = new Warnings(this);
 
         // Object space manager needs to come early before we create any objects
@@ -668,4 +673,8 @@ public class RubyContext extends ExecutionContext implements TruffleContextInter
 
         return env.importSymbol(name.toString());
     }
+
+    public ClockGetTimeMonotonic getMonotonicClock() {
+        return monotonicClock;
+    }
 }